* { box-sizing: border-box; }
html, body, div, span, h1, h2, h3, p, a, form, label, input, button, section, header, main, footer { margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
body { min-width: 320px; }
img { display: block; max-width: 100%; }
button, input { font: inherit; }
a { color: inherit; text-decoration: none; }
button { border: 0; background: none; }